No one's explaining it particularly well, so I'll try to break it down.
Let's say one company offers you $400k of equity vesting over four years. On your start date, they'll use the current price of the stock to translate that into a number of stock units (RSUs, typically), and then you'll get those stock units according to your vesting schedule. Let's say, for ease of calculation, that this $400k translates into 480 RSUs. So you'll vest 30 RSUs every quarter (let's ignore a cliff). If the price of the stock is rising, the 30 that vest in those later quarters will be worth more than the 30 that vested in your first quarter. Your last 30 units will be worth _a lot_ more than your first 30 units.
Now let's say a company offers you $100k for your first year, and promises to refresh you another $100k each year thereafter. Your first year, they give you 120 units for the $100k. But your second year, the stock price has gone up, so $100k doesn't translate into 120 units anymore; it translates into maybe 100 units, or 80 units. Your second year, the stock price has gone up even further, and $100k translates into even fewer units. Likewise your fourth year. These per-year refreshes "reset" the value back at $100k each year, when a four year refresh would "accrue" more value, year over year, if the stock keeps going up in price, which tech stocks typically do.
For a concrete example, at a former employer (GOOG) I was granted $150k of stock in 2019, vesting quarterly over four years. When I left in 2021, the value of the remaining shares of that grant was...$155k! The stock had more than doubled in price from the time of the grant, but it was still vesting according to the _original_translation from value to units. So the unvested value of _half_ the grant units were worth _more_ than the original grant, even after I'd already vested half the units.